/*  
  -- The Lime II Project -- 

  A tuplespaces-based middleware for coordinating agents and mobile hosts.
  Copyright (C) 2005.
  Gian Pietro Picco, Amy L. Murphy, Lorenzo Bellini.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received this copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
*/

package lime2;

/**
 * Defines the policies for a LimeTupleSpace. 
 * 
 * @author Gian Pietro Picco
 * @author Amy Murphy
 * @author Lorenzo Bellini
 */

public interface Policies 
{
 /** 
  * Conservative: the main policy - it performs reconciliation of misplaced tuples, ghost tuples and reactions. Even 
  * in case of communication failure it guarantees neither loss nor duplication of tuples.
  */
 public final static byte CONSERVATIVE = 3;	
	
 /** 
  * Loss: doesn't perform reconciliation, even the non-lazy. This is a secondary policy designed for scenarios (i.e. 
  * wired LAN) where reliability can be sacrificed to fast (real-time) tuple messaging. The assumption is that tuples
  * and reactions are always delivered to all hosts. In case of communication failure, tuples can be lost.
  */
 public final static byte LOSS = 1;
	 
 /** 
  * Duplicate: doesn't perform reconciliation, even the non-lazy. This is a secondary policy designed for scenarios 
  * (i.e. wired LAN) where reliability can be sacrificed to fast (real-time) tuple messaging. The assumption is that 
  * tuples and reactions are always delivered to all hosts. In case of communication failure, tuples can be 
  * duplicated.
  */
 public final static byte DUPLICATE = 2;

 /** 
  * Default policy. 
  */
 public final static byte DEFAULT = CONSERVATIVE;
 
}
